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Soil Themes > Soil Erosion > G2 Model

G2 model for erosion

G2 Logo G2 model is a new model for erosion, resulted from the cooperation of JRC/IES/Land Resource Management Unit/SOIL Action and the Lab of Forest Management and Remote Sensing, School of Agriculture, Forestry and Natural Environment of the Aristotle University of Thessaloniki in the framework of geoland2 project.

G2 allows for mapping estimates of soil loss (in t/ha) from sheet and interril erosion caused by raindrop splash and surface runoff, on a month-time step on a local to regional scale. G2 inherits its fundamental equations from USLE, especially the estimation of rainfall erosivity and soil erodibility. However, it is innovative in the estimation of the vegetation coverage and management parameter, which is based on a combination of empirical tables from USLE and Gavrilovic (EPM) models. It also introduces a corrective factor to the topographic parameter.

The formula of G2 is:
E=(R/V)*S*(T/I)
Where:
E: erosion (t ha-1)
R: rainfall erosivity (original USLE formulas or alternatives developed by G2 or other authors) (MJ mm ha-1 h-1)
V: vegetation retention (developed by G2 using Biopar data or equivalent and land use/management databases, e.g. CORINE) (dimensionless; V>=1)
S: soil erodibility (original USLE formulas or modified USLE by JRC, 2012) (t ha h MJ-1 ha-1 mm-1)
T: topographic influence (USLE modifications, 1996; strict implementation of USLE terms) (dimensionless; T>0)
I: slope intercept (developed by G2 using satellite data; corrective to T; partially analogous to P of USLE) (dimensionless; 1 =< I=<2)

G2 employs harmonized standard input data from European and global databases, such as the LUCAS soil database, the European Soil Database (ESDB), the Topsoil Organic Carbon (TOC), BioPar products of geoland2, Image 2006 imagery, CORINE LC, Landsat TM, the ASTER DEM datasets, and other large public datasets. As a data-oriented model, the cartographic scale of a G2 implementation is determined by the spatial resolution of the input data.

G2 is a dynamic, feasible, easy to run model, providing alternatives for the estimation of all erosion factors. Several published studies of G2 implementation, e.g. in the cross-borders basin of river Strymonas/Struma (Greece and Bulgaria), in the basin of rivers Ishmi and Erzeni (Albania), and in the Mediterranean island of Crete (Greece), have provided realistic results. Currently, the model is being implemented at the national scale (in the whole of Greece).

For further details contact the Authors


Download the Data

To get access to the data, please compile the online form; instructions will then follow how to download the data. Soil erosion layers (Total & Monthly) plus Rainfall erosivity (Total & Monthly), vegetation retention (Total & Monthly), soil erodibility, topographic influence and slope intercept are available for the two (2) application areas:

More Information - Links

A complete description of the G2 model and relevant applications (Strymonas, Crete, Albania) are provided in the following papers:

Download a presentation of G2 Model.

Crete Erosion Map

Figure 1. Crete island, Greece; the Annual Erosion Map (t/ha) resulting from the month-step erosion maps.


Strymonas Strymonas

Figure 2. Strymonas/Struma catchment, Greece/Bulgaria: Indicative Month-step Erosion Maps (t/ha) (May, November).


land use distribution

Figure 3. Temporal distribution of erosion rates in Crete for all land uses, agricultural land use and natural grasslands.



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